<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./js/vue.js"></script>
    <style>
        #app{
            border: 2px solid black;
            padding: 10px;
            margin-bottom: 400px;
        }
        .child{
            margin: 20px;
            padding: 10px;
            background-color: #cccccc;
        }
    </style>
</head>
<body>
    <div id="app">
        <h3>父组件范围</h3>
        <p>params.msg:{{ params.msg }}</p>
        <input type="text" v-model="params.msg">
        <child-one :params="params"></child-one>
    </div>

    <template id="ChildOne">
        <div class="child">
            <h3>子组件one</h3>
            <p>params.msg:{{ params.msg }}</p>
            <input type="text" v-model="params.msg">
        </div>
    </template>
</body>
<script>
    Vue.component("ChildOne",{
        template:"#ChildOne",
        props:["params"] // props 的只读为栈的只读
    });
    var vm = new Vue({
        el:"#app",
        data:{
            params:{
                msg:"父组件数据"
            }
        }
    });
</script>
</html>